Update Fn: Executor New Deployment (#504)

Enables updating functions of executor type new deployment and switching between executor types for a function.

test/tests/test_backend_nd_update.sh

@@ -0,0 +1,91 @@
+#!/bin/bash
+set -euo pipefail
+
+# global variables
+pkg=""
+http_status=""
+url=""
+
+
+cleanup() {
+    if [ -e "test-deploy-pkg.zip" ]; then
+        rm -rf test-deploy-pkg.zip test_dir
+    fi
+    if [ -e "/tmp/file" ]; then
+        rm -rf /tmp/file
+    fi
+}
+
+create_archive() {
+    log "Creating an archive"
+    mkdir test_dir
+    printf 'def main():\n    return "Hello, world!"' > test_dir/hello.py
+    zip -jr test-deploy-pkg.zip test_dir/
+}
+
+create_env() {
+    log "Creating environment"
+    fission env create --name $1 --image fission/python-env:latest --builder fission/python-builder:latest --mincpu 40 --maxcpu 80 --minmemory 64 --maxmemory 128 --poolsize 2
+}
+
+create_fn() {
+    log "Creating functiom"
+    fission fn create --name $1 --env $2 --deploy test-deploy-pkg.zip --entrypoint "hello.main" --executortype newdeploy --minscale 1 --maxscale 4 --targetcpu 50
+}
+
+create_route() {
+    log "Creating route"
+    fission route create --function $1 --url /$1 --method GET
+
+    log "Waiting for router & newdeploy deployment creation"
+    sleep 5
+}
+
+update_archive() {
+    log "Updating the archive"
+    sed -i 's/world/fission/' test_dir/hello.py
+    zip -jr test-deploy-pkg.zip test_dir/
+}
+
+update_fn() {
+    log "Updating function with updated package"
+    fission fn update --name $1 --env $2 --deploy test-deploy-pkg.zip --entrypoint "hello.main" --executortype newdeploy --minscale 1 --maxscale 4 --targetcpu 50
+
+    log "Waiting for deployment to update"
+    sleep 5
+}
+
+test_fn() {
+    log "Doing an HTTP GET on the function's route"
+    response0=$(curl http://$FISSION_ROUTER/$1)
+
+    log "Checking for valid response"
+    echo $response0 | grep -i $2
+}
+
+# This test only tests one path of execution: updating package and checking results of function
+# There might be potential future tests where one can test changes in:
+# environment, min & max scale, secrets and configmaps etc.
+
+# This test in summary:
+# Creates a archive, env. with builder and a function and tests for response
+# Then updates archive with a different word and udpates functions to check for new string in response
+main() {
+    # trap
+    trap cleanup EXIT
+
+    env=python-$(date +%N)
+    fn_name="hellopython"
+
+    create_archive
+    create_env $env
+    create_fn $fn_name $env
+    create_route $fn_name
+    test_fn $fn_name "world"
+    update_archive
+    update_fn $fn_name $env
+    test_fn $fn_name "fission"
+    log "Update function for new deployment executor passed"
+}
+
+main